The Ocean Planet is a traveling exhibition from the Smithsonian Institution designed to share with the public what recent research has revealed about the oceans and to encourage ocean conservation. This booklet of lessons and activities adapts several themes from the exhibition for use in middle and high school classrooms. Lesson plans include: (1) "Sea Secrets" that explores ocean geography; (2) "Sea Connections" that looks at plants and animals that live in different marine ecosystems; (3) "Pollution Solution" that examines the effects of an environmental crisis; (4) "Stranded Along the Coast" that explores both natural and human causes of animal strandings; and (5) "Reflections on the Sea" that explores the influence of oceans on language and literature. Each lesson plan contains background information, a statement of learning objectives, a list of required materials, step-by-step procedures, student handouts, and a list of educational resources including connections to the online version of the Ocean Planet exhibition. (JRH)